public class Example2_2 {
  public static void main (String args []) {
     byte b = 22;
     int n = 129;
     float f = 123456.6789f;
     double d = 123456789.123456789;
     System.out.println("b = "+b);
     System.out.println("n = "+n);
     System.out.println("f = "+f);
     System.out.println("d = "+d);
     b = (byte)n;   //导致精度的损失
     f = (float)d;  //导致精度的损失
     System.out.println("b = "+b);
     System.out.println("f = "+f);
     }
}
